When acting as a principal, how do investment dealers generate revenue?

When acting as aprincipal, investment dealers buy and sell securities for their own account. They generate revenue by earning aspread, which is the difference between the price at which they buy securities (bid price) and the price at which they sell them (ask price). This is distinct from their role as an agent, where revenue is earned through commissions on trades executed on behalf of clients.

A. Through commissions: Commissions are earned when acting as an agent, not as a principal.

B. Through tracers: This term does not apply to revenue generation.

C. Through brokerage charges: Brokerage charges relate to fees imposed on client accounts, not principal trading spreads.